Mitch McConnell is fulfilling his promise to Democrats by opening up the Senate floor for a fortnight of immigration debate, but the Senate majority leader's intentions are a mystery, Politico reports.

Nobody seems to know what, if any, immigration legislation McConnell would support to clear the Senate or what his endgame might actually be, Politico reports.

"He's trying to be an honest broker in this and just make sure that he treats people fairly. I'm sure he has his preferences. I've never heard him express them, exactly," No. 3 Senate Republican John Thune told Politico.

Democrats fear McConnell plans to fulfill his pledge by letting the kids play noisily for two weeks before shutting it down without any relevant progress.

"My worry is that the majority leader could honor the letter of the agreement by bringing a debate before the Senate, but then not act constructively," Democratic Sen. Chris Murphy told Politico. "There is a big difference between a majority leader actively trying to get his members to yes versus a passive majority leader."

As I’ve said publicly many times, our upcoming immigration debate on #DACA, border security, & other issues will be a process that is fair to all sides. While I obviously cannot guarantee any outcomes, let alone supermajority support, I can ensure the process is fair to all sides

Though it puts to end the hand-wringing over whether McConnell would honor his promise, the "what's next" ahead of the March 5 deadline imposed by President Donald Trump is anybody's guess, Politico reports.

But the facts are these: Opening the debate is a rare move for McConnell, especially on this issue at this time. And it's in stark contrast to how McConnell tackled the Obamacare repeal efforts - behind closed doors with a hand-picked group of GOP senators.

"In fairness to Sen. McConnell, he has said publicly and privately in ways that I believe that we are now going to have an honest debate," Senate Minority Whip Dick Durbin told Politico.